AT-56 AUTOMATIC TRANSMISSION — Removal of Component Parts (b) Using SST, measure the stroke applying the compressed air (4 — 8 kg/cm², 57 — 114 psi or 392 — 785 kPa) as shown in the figure. SST 09240-00020 Piston rod stroke: 1.5 — 3.0 mm (0.059 — 0.118 in.) If the values are nonstandard, inspect the brake band. (See page AT-93) 24. REMOVE SECOND COAST BRAKE COVER, PISTON AS-SEMBLY AND SPRING (a) Using SST, remove the snap ring. SST 09350-30020 (09350-07060) (b) Applying compressed air to the oil hole, remove the second coast brake cover, piston assembly and spring. (c) Remove the two O-rings from the cover. 25. REMOVE OVERDRIVE SUPPORT ASSEMBLY (a) Remove the bearing and race. (b) Remove the two bolts holding the overdrive support assembly to the case.